* Add initial python support to CMake build

* pybind11 2017-04-07 (1df91d36)

Code extracted from:

    https://github.com/pybind/pybind11.git

at commit 1df91d36cfa997c8987889234304ea5e37cc3e68 (v2.1.1).

* Build python bindings with cmake

* Adjust for adios2py -> adios2 module name

Applied autopep8 from python-pep8 for flake8 formatting in py

Issues:
Linking with Python 3.5 not working as-is with PyBind11
Passing a new communicator in IO Open fails (mpi4py?)

To do:
Add more test cases from other engines

Python bindings running but not printing values with bpls. Min and Max
captured correctly.

IO SetParameters and AddTransport will accept vector and map

Variable.cpp and Variable.tcc for complete separation of core components
in the public include

Python bindings now working with PyBind11

DefineVariable)

Adding Variable<void> map container in ADIOS for unknown variable types
(until Write). This is required in Python.

Moved CheckBufferAllocation to functions/adiosFunctions.h to make it
available to all engines

Added MethodPy in Python bindings, SetParameters and AddTransports use
raw functions to accept any number of arguments in the form of a
dictionary. Tested with test_hello.py

Started implementation of bindings/python using boost::python
Modified Makefile to allow for dynamic library compilation

To do:
Work on time aggregation